[rightbyte]

Not really. You clearly see that the intent at some point was to add two numbers, and not some fiction about ADD the diagnosis or what ever.

[ablob]

So which one is right, the name of the function (the comment), or it's implementation?

[rightbyte]

Rethorical question? You can't know that without looking on how the function is used.

You at least know something is strange from the comment.